pratt



2 Sheets-Sheet 1.

Patented May 26, 1885.

N. W. PRATT.

STEAM GENEEATOE.

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TNVENTOE ATTORNEY WITNESSES (No Model.) 2 Sheets-Sheet 2. N. W. PRATT.

STEAM GENBRATGR.

110.318.501. Patented May 26, 1885.

WITNESSES INVENTOR MMM/w( M8 BY mwumognmr, wuningm. D. c,

MBD raras NATHANIEL W. PRATT, OF BROOKLYN, NEW YORK.

STEAM-GENERATOR.

SE'ECIFICATION forming part of Letters Patent No. 318,501, dated May 26, 1885.

Application filed Juno 20, 1884.

To all whom it may concern:

Beit known that I, NATHANIEL W. PRATT, a citizen of the United States, residing at Brooklyn, in the county of Kings and State of New York, have invented certain new and useful Improvements in Steam-Generators, of which the following is a specification, reference being had to the accompanying drawings, forming a part of the same, in which- Figure l is a side elevation, partly in section, and Fig. 2 an end elevation, partly in section, of a steam-generator embodying my improvements.

The improvements referred to in this application relate to sectional steamgenerators, and are embodied, for illustration, in a type known as the Babcock and VVilcoX Vater- Tube Boilers/7 for which several patents have already been granted, including various improvements thereon.

This invention consists in certain details of construction, which I will describe.

In the drawings, c is the steam and water drum; b, the manifolds or cross-headers connected with the drum a and headers c by means of the expanded nipples 7L and circulating-pipes f.

e are the generating-tubes, connected at each end in series with the headers c, and constitute the main heating and generating surface. The rear headers are each formed in a single piece, while the front headers are made in two parts joined together by the expanded nipples h, as shown in Fig. l, this variation being made to allow for the unequal expansion and contraction that take place, due to the unequal heating of the connected tubes.

g is a mud-drum, also connected with the rear headers beneath their lowest point. The object of this mud-drum g is to accumulate the deposits of the generator, and is therefore located at the lowest point of circulation, and also the farthest removed from the fire. This mud-drum is connected with all the sections by means of expanded nipples h, and provided with a boss, m, to which a blow-off pipe is connected for removing the accumulated deposits, and also with a boss, a, to which a pipe-connection may be made for returning the condensed water from a steam-heating system. The boss m is placed near the bottom of the mud-drum, in order to carry off all the deposit, and the boss a placed above or near the top of the same, so that the inflow- (No model.)

ing current of water will not disturb the deposit collected at the bottom.

Z represents the furnace, and t' z' the fiamebridges, which, together with the bridge-wall k, determine the course of the gases across the tubes in the passage from the furnace to the stack.

p is a deliecting plate or diaphragm arranged over the openings to the drum leading from the cross-headers b, as shown in Fig. 2, and in dotted lines, Fig. 1. The purpose of this plate is to prevent the rapidly-circulating water and steam that rise from the generatin g-surfaces from being projected upward into the steam-space; and it acts to deflect the current in a horizontal directiomwhich allows the steam to slowly separate in passing to its outlet at the rear end of the drum.

Vithin the drum a a dry pipe, is placed, communicating therewith at the point a, or wherever the dryest steam is delivered. The ends of this dry pipe are supported incastings y y.

It will be observed that the rear or continuous header is held firmly in place by its connection with the mud-drum g and circulating-pipes f, while the front or sectional header is connected at its top only, and the object in constructing it in sections is to allow a greater rate of expansion, owing to its exposed situation in relation to the re.

Having thus fully described my invention, what I claim, and desire to secure by Letters Patent, is

1. In a water-tube generator having a series of generating-tubes, said tubes being secured at one end to a continuous header and at their opposite end to a header composed of communicating sections, whereby said header composed of communicating sections provides for its greater rate of expansion, as described.

2. In a watertube generator having a steam and water drum communicating through openings with a series of circulating or heating tubes, substantially as described, a dciecting plate or diaphragm arranged within said drum near and directly over or in line with said openings, whereby the course of the current of steam and water entering the drum is changed, for the purpose specified.

` NAT. IV. PRATT.

Witnesses:

Grills. W. FORBES, JOHN S. CALDWELL. 

